Forgot to mention that for some reason, there appears to be
quite a shortage of cabs in Siena. At the bus station,
there's a taxi stand but we had to wait about half an hour
to get one. When we were going to return by bus to Rome, we
ordered a taxi to take us back to the bus station, and once
again, had to wait a very long time. So, be sure to leave
time for this delay. Why this is, is anyone's guess!